Microwave oven



FIG. 1 is a top, front and right side perspective view;

FIG. 2 is a top elevational view thereof;

FIG. 3 is a front plan view thereof;

FIG. 4 is a bottom elevational view thereof;

FIG. 5 is a back plan view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a left side view thereof. 

The ornamental design for a microwave oven, as shown. 